RE: [PATCH] kfence: use TASK_IDLE when awaiting allocation

[David Laight]

From: Marco Elver
> Sent: 21 May 2021 09:32
> 
> Since wait_event() uses TASK_UNINTERRUPTIBLE by default, waiting for an
> allocation counts towards load. However, for KFENCE, this does not make
> any sense, since there is no busy work we're awaiting.
> 
> Instead, use TASK_IDLE via wait_event_idle() to not count towards load.

Doesn't that let the process be interruptible by a signal.
Which is probably not desirable.

There really ought to be a way of sleeping with TASK_UNINTERRUPTIBLE
without changing the load-average.

IIRC the load-average is really intended to include processes
that are waiting for disk - especially for swap.

	David

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